Ulva is considered the main component of "green tide" events in bays especially near large cities in Japan and elsewhere. Its prolific growth becomes a nuisance, especially in run-off waters containing high nutrient levels. In these environments it can outcompete other organisms and reduce diversity in benthic communities. It also creates a nuisance on beaches when it is washed up and decomposes in large amounts as the rotting algae produces hydrogen sulfide gas (Lee 2008; Yabe 2009).
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